Answer:
He wanted to justify his recommendations for expanding the Korean War.
Explanation:
When Truman announces his decision to the American people, he points out that the United States wants to avoid a third world war and that General MacArthur disagrees with that policy. But the nation treats MacArthur as a hero. When MacArthur addresses Congress, he receives a standing ovation. Approval of the president drops.
He wanted to explain why he was right and Pres. Truman was wrong.